基于土壤图的农用地分等因素解译与校核

Interpretation and Verification of Agricultural Land Grading Factors Based on Soil Map

第三次全国国土调查要求完善耕地分等调查评价基础数据.满足该要求的技术关键在于校核农用地分等因索准确性。本文在明确农用地分等因素内涵及归纳数据来源的基础上,以温县为例,在县域尺度上探讨分等因素选择的合理性,解译各土种质地和剖面构型指标值,参照农用地分等数据库实地布设55个采样点对分等因素开展校核,结果表明:质地解译校核结果不一致的样点有9个,剖面构型解译校核结果中褐土化淤土、褐土化两合土、小两合土构型存在差异;分等数据库中黏土区域及黄庄镇、武德镇、北冷乡接壤处砂土区域表层土壤质地与调查结果不符因此,建议在合理选择农用地分等因素的前提下校正农用地分等数据库并细化质地与构型的分等标准;建议进行第三次全国土壤普查.为耕地分等调查评价I:作提供更准确的基础数据。

The Third National Land Survey requires improving the basic data of the Survey and Evaluation of Arable Land Grading.The key technology to meet this requirement is to verify the accuracy of agricultural land grading factors.On the basis of defining the connotation of agricultural land grad i ngfactors and summarizing its data sources,taking Wen County of Henan Province as an example,we discussed the rationality of the selectionfor grading factors at the county scale,interpreted the index values of topsoil texture and profile configuration,and carried out theverification according totheagricultural landgrading databasefor fifty-five sampling points in the field.The results showed thatthe interpretation texture of 9 sample points were inconsistentin checked results.The configuration of cinnamonized two-combined soil,silt soil and small two-combined soil were different between the interpreted and checked results.The texture of topsoil in the northern area,the river system and the adjacent areas of Huangzhuang,Wude and Beilingxiang of the grading database were not in conformity with the actual situation,which needs to be updated.Therefore,the agricultural landgrading database should be updated and the grading criteria of topsoiltexture and profileconfiguration should be refined based on the reasonable selection of agricultural landgradingfactors.TheThird National Soil Survey issuggested to be carried out in order to provide more accurate basic data for the investigation and evaluation of arable land grading.